I really like the simplicity and even the UI of Keep, but I can't help the fact that with this being a really useful and lovable Google product comes a clock in the back of my mind slowly counting down.
If you want full control, your only real choice is to use something open source, host it yourself, and take care of all associated dev ops.
Knowing where my note files are and not having to worry about accessing them is a priority.
Whatever metrics you want to point at as to how long Google service x survives doesn't magically make that clock go away in my mind. It's there. It's present.